Roughing and finishing tool



p 1952 B. L. JOHNSON 2,611,222

ROUGHING AND FINISHING TOOL 2 SHEETS SHEET 1' Filed April 29, 1949 /3 CZL IIA e2" 0 won 2 Sept. 23, 1952 JOHNSON 2,611,222

' ROUGHING AND FINISHING TOOL Filed April 29. 1949 2' SI-IEETS--Sl-IEET 2 Bard L.'Joz1nson Patented Sept. '23, 1952 ROUGHING AND FINISHING TOOL r I Berd L. Johnson, Billings, Mont.

, Application April 29, 1949, Serial -No 90,365

1 This invention relates to a new and improved roughing and finishing tool, especially designed and 7 adapted for use in engine cylinder jobs known'as glaze busting, namely the removal of the glaze in the bores so that new piston rings may wear down quickly to acorrect close fit.

The roughing and finishing tools heretofore available, when of the type using emery or other metal working cloth as the abrasive, commonly referred to as metal clot usually were objectionable because of the-difiiculty of replacing the metal cloth when worn' out.' It-is, therefore, one of the principal objects of my invention to provide a bore finishing tool of a more practical design, in which hones of a new design are provided to facilitate replacement of metal cloth, each hone unit comprising a roll of metal cloth wound on a tubular rubber core and arranged to be clamped to a carrier bar bymeans of aclamp bar slipped through the tubular core piece and detachably and adjustably secured at its ends" to the carrier bar by screws, so that the cloth roll may first be freed by loosening the screws and then turned to pay out the worn out end portion, which can be out or torn off after the screws have been tightened again to clamp the roll in its adjusted position, this construction and mode of adjustment reducing waste to a minimum and enabling most economical use of the metal cloth.

Another important objectv of my invention is to provide a tool of the kind described in which the metal cloth rolls used as hones'are interchangeable with pieces of carborundum Or other similar grinding or honing material, the supporting back plates of which are designed to be fastened to the carrier bar by means of the same screws otherwise used for fastening the clamping bar for the roll of metal cloth,

Finally, and considered to be the most important, it is another object of my invention to provide a tool of the kind described, the spindle of which is designed to be driven by insertion in the chuck of an electric drill or similar portable hand tool, said spindle extending into a rotary honing head or hub member where it is connected by means of a rotary plate with a plurality of hone supporting arms that are slidably guided intermediate their ends in the head for radial movement and pivotally attached at their inner ends to the rotary plate, so that when the tool is entered in an engine cylinder bore and the electric motor is started, the arms, weighted by the hones which act, as flyweights, are thrown outwardly automatically under centrifugal force to allow the hones to move into working contact 19 Claims -(01. 51 1s4.1)-

with the cylinder walls and then hold them t ere.

under the torque of the motor. While the mode of operation just outlined is generally preferred for reasons believed to be obvious, it is also possible, with a small change in construction, to set; all of the arms simultaneously at a desired radius for'operation in a certain-sized bore and clamp the" same simultaneously in such adjusted tionship to the honing head.

The hone units are loosely 'pivotally connected at the mid-points of their carrierbars-to the relaouter ends of the revolvingarms inzT-arrangement so that thehones 'arefree to adjust theme selves to be certain of full length engagement with the cylinder walls for efiicient honing re:-

gardless of the position of the driven spindle which at times will not be of the bore. 1

held. truly coaxially i The invention'is illustrated in the accompanyf ing drawings,- in which Fig. 1 is a side view of aroughing and finishi-E ing tool made in accordance with my inventionr 2' Fig. 2 is a vertical section on line 2--2-ofFig*." 3;* Fig. 3 is a plan view of Fig. l, showinga'portion ofthe head broken away'better to illustrate the construction and including a dotted'line'pro jected position of one of the arms tin-illustrate the expansibility of the tool to work in'bores of various sizes within a 'certainrange, depending; of course, upon the size of the tool, tools of small,

medium and-large size being furnished tq take i care of the whole range of engine cylinders; a

Fig. 4 is aside view of the head or'hubfpoition of another roughing 'and'fi'nishing' tool ormyg invention, showing a modified-or alternative construction insofar as the-provision of means for adjustably clamping the hone supporting arms is concerned Fig. 5 is a fragmentary side view of [another roughing. and finishing tool of my invention,'. showing a modified or alternative construction insofar as the loose rocker. mounting of the hones on their co-operating arms is concerned;

Fig. 6 is a sectional detail on line 6 -6 of Fig. 5,

and

Figs. 7 and tively, of a Carborundum or otherstonehone showring how it may be fastened interchangeablypn the same carrier bars ,used with the-rolls flof, metal cloth provided as hones onthe' tools;

in the other figures.

Similar reference numerals are. applied to corresponding parts in the various views.

Referring first to Figs. 1-3, the reference nu 8 are a side and front view, respec;

slots l6 are provided inicircumferentially spaced-:10

relation, 120 apart. Slots I6 serve as guides for the intermediate portions of arms I! that are-.. pivoted at their inner ends, as at l8, on the flanged lower end portion I9 of theirotary'hubx or head 20. The arms I! are free to oscillate in 1 recess I4 around pins l8 as pivots so asto project to varying degrees through slots .16, the -dottedcline position of the one arm in Fig. 3 being an extreme position. Spindle 9 is disposed'on 'the longitudinal axis of the rhead 2D and extends frely tlirough an axial:bearingx'hole .2 lzproyidedp in 'said head and has: an annulari groove 22 pro=rvi'ded thereing-in'whichiqa :splitsnap: ring:=.2 3. .is. received to -preventaupwarddisplacement ofrthe= hub; a washerrbeing preferably inserted-between the ring 2:11am thetupperend of:the;head.:. Hone. un1ts' 25 or: 25 (Fig's::!7-8)f.pivoted as at 26; onuthe outer ends of 2 arms '11 in'rrright' "angle or T' arrangement with respect; thereto 'actas :fly-- weights whenxthe' electricnnotor :to=which1..the 3 spindle is attachedzisista'rted. The driving torque..- is-transmitted'fromitspindlelfl to plate 12 to drive the: assemblyinza clockwise direction asindicated by' thei-arrow in'JFig". 3.." However,.inasmuchas thezarmszri I. arefpivoted to'xthehead 20 at. 3 anchth'e platen-12 isifree ;to;tmn relative to-the head Sand as: :the? .driving" torque is: transmitted. directly to it and it has sliding contact-atzrlt witliitheiarmsr i 1., it iseasyto-seethatthe arms I! will be swung outward1y,3eachswingingin a '1 clockwiseidirection zarounditspivot-l8, 1. Itxmust berememberedmowever; that'thehone-1mitsact as flyweights-the momenttherassembly is turned, andmconsequently; they? are also-'throwrr outwardly under centrifugakfo'rce, the :forcebearing. i i a predeterminedrelationship :to the1R;--P.1 M.. of the'spindle 9. The hones. are therefore-heldin close --.work i-ng"- contact with: the cylinder -walls indicated--by .the :dotted .line circle 21 -in ..-Fig-. '3..- Fig-a4 shows a modifiedon alternative constructiomin. which .all: correspondingparts are; numbered similarly spindle'ea, instead oft, and so on... A.-clearanceis-left at 28 betweenwthe top of flange l5a-and.bottom ofrflange i9a-so that the. arms. Ilarnay-'be.-.clamped;-;between.the-plate I20. and '1 head .200,.byuthectightening of a :nutJZS. that. threadsnonthe..threadedfportion 30-.of. spindle projecting from the top of head 2011. A look washer or .a lock nut maybe provided in com binatioh with nut 29' to prevent its loosening accid'entally. This constructionenable's setting thearmsila' simultaneously at a desired operating'radiusfoi"operation of the hones 25 or 25' in a certain sized bore-with a predetermined light, medium, or heavy working pressure; and clamping the arms in such adjusted relationship to the head.f

Eichihone'.'unit'l::25 comprises 'a'"strip-'3| of "riietal "clo'th or -='other suitable "flexible sheet abrasive'wound irito the-formof a tight roll on-a -7 rubber 111136.31 as.'a:core with the abrasive face on the outside. That much will be sold as are-z placementfipart" and can be made. available at .a low price. The rollwith its core piec'e is clamped ontma carrier-or cross-bar- 33' by; entering. a clamp 4 bar 34 through the core and fastening the ends of the bar 34 to the ends of bar 33 by screws 35. The rubber tube 32 serves two important purposes aside from being merely a tubular core or mandrel upon which to wind the metal cloth, namely, (1) that of afiording the needed resilience in the clamping of the roll to the bar 33, as best shown in Fig. 2, so that there will be no likelihood of the screws 35 loosening when once properly-J tightened, and (2) that of. affording the desired amount of yield" and resilience in the engagement of the roll with the cylinder wall, as should also be clear from a study of Fig. 2. Each arm-H hasa rabbet cut on the outer end as indicated at 36 to accommodate the associated carriei'bar- 33 for a loose pivoted connection on a rivet.26, allowing the amount of oscillation indicated by the dotted line positions in Fig. 2, whereby thehones are free to adjust themselves to the cylinder walls regardless of the deviation of .the spindle 9 from .anaxial position in; the

bore. The-rivets26. are also-loosein their holes-- in the arms i1 and bars 33 so that. the hones mayof angular-adjustment just'referred to. joints at--26; in other words, must have universal action. With that-in mind-I may, as .shownat 31 in Figs..5 and. 6,-give the side-face of the rabbet 36a a-crown formationso that easier. rocking. action .-of.the hone.25b ispossible in a plane at:

right angles to the arm I lb, with the samefacility for pivotal movement about the-rivet 26 as in the; other construction. It will, in-passing-, be noticed at. 38.in Fig..5 that. the honecarrier-bar 33bisv notched out .to half its thickness to accommodate the rabbeted-end36a of the arm 11b, so that the. ends-of notch- 38' limit the-rocking movement 015:; honed 5b .in...one-- plane. and the .inner .end. .of 1 rabbet- 36a limits the rocking. movement .in-the s plane. at right angles.

In. conclusion, it. will'jbeseen inFigs. .7 and 8 1 how I. the... Carborundum ..hones: .25. which. are- 4i. formed on the ends of the back plates from theweb portions of thechannels thereof. In this .waybne may. easily'useImetalJ cloth hones on certa'irLJ'obs and switch to stone. hones .on other jobs. .Itigoes-alsowithout saying that, if desired. the hone..on..one .oithethree armsofthe tool maybeomitted and.-a felt onothersuitablewiper used. on -thatarmtocle'anoff grit and released 1 particles of..emery and-'steelcin the..course of..a honing. zoperation... It; should also be clear. that...

while the mechanical movement isshown. em-

bodied-inthe presenttool for. honing it may. be usedforyarious. other. purposeswherever. the.

expansibility feature is needed.

It isbelieved the foregoing description conveys a good-understanding of the objects and advan-- tageswof -my invention.- The appended claims have-been drawn to cover all legitimate modificae tions-and; adaptations.

I claim:

1.:In a-tool of. the character described; a rotatable-circular head,a circular plate in:assembled coaxial-.firelation .to :said headand ,:adapted "to: turn: with. respectv thereto; a. drive spindle for the tool extend-ingthroughacentral axia1:bearing in said-'headandssecured tosaid plate, elongated arms-pivoted at: their inner, ends on said head at *circumferentially:spaced points that. are spaced" radially outwardly from the longitudinal'axis' elongated form disposed substantially'parallel to the longitudin'al axis of the head and pivotally mounted intermediate theirends on and weighting as flyweights the outer'ends of saidarms, and guides on the peripheral portion of said plate slidably abutting the intermediate portions of saidarms.

2. A tool, as set forth in claim 1 including means securing the plate against turning relative to said head from a selected angularly adjusted position of rotation relative to said head.

3. A tool as set forth in claim 1 wherein said arms are disposed between said head andsaid plate, said tool including means fastening said plate against turning relativeto saidhead from a'selected angularlyadjusted position of rotation relative to said head and so as to clamp said arms frictionally on the top and bottom surfaces thereof in an adjusted position.

4.-A tool as set forth in claim 1 wherein said arms are disposed between said head and said plate, said tool including means fastening said plate against turning relative to said head from a selected angularly adjusted position of rotation relative to said head and so as to clamp said arms frictionally on the top andbottom surfaces thereof in an adjusted position, said means com prisinga nut threaded on said spindle and arranged to jam against the end of said head remote from said plate and arms, whereby to draw the'plate toward said head by means of said spindle. I 1

-5.' A device of the kind described comprising a head formed to provide an elongated central axial bearing with an annular flange on one end,

a drive spindlehaving a working fit in and extending through said bearing, a circular plate fixed on the projecting end of said spindle in coaxial relation to the spindle and head and having an annular flange on its edge portion projectin toward and abutting the flange on said head and having slots provided therein in" circumferentially spaced relation, elongated arms pivoted at their inner ends on the flange portion of said head at circumferentially spaced points that are spaced radially outwardly from the I longitudinal axis of the head, said arms being slidable intermediate their ends in and extending'through'said slots as guides, and abrading' devices of elongated form disposed substantially parallel to the longitudinal axis of the head and pivotally mounted intermediate their ends on'and weighting the outer ends of said arms as flyweights.

6. A device of the kind described comprising a head formed to provide an elongated central axial bearing with an annular flange on one end,

a drive spindle having a working fit-in and ex-, 1

tending through said bearing, a circular plate fixed on the projecting end of said spindle in coaxial relation to the spindle and head and having an annular flange on its edge portion projecting toward the flange on said head and having slots provided therein in circumferentially spaced relation, elongated arms pivoted at theirinner ends onthe flange portion of said head at circumferentially spaced points that are spaced form disposed substantially parallel to the longi 6 tudinal axis of the head and pivotally mounted intermediate their ends on and-weighting the outer ends of said arms as flyweights, and means securing said plate against turning relative to said head whereby toffix' the am's so as to hold a selected radially adthe; abra'ding devices in justed position.

7. A device of the in through said bearing, a circular plate fixed on the projecting end of said spindle in coaxial relation'to the spindle and head and having an annular flange on its edge portion projecting said arms bein'gs'lidable intermediate-their ends in and extending through saidslots asguides,

abradi-ng devices of elongated form disposed substantially parallel to the longitudinal axis-of the head and pivotally mounted intermediate their ends on and weighting 'the outerends'of said armsas flyweights, and means fastening said plate to said head against" turning relative to it and-so as to clamp said'a'rmsfrictionally on the top and bottom surfaces thereofbetweenisaidj head and plate in adjusted position;

8; A device of the kind described comprising" a head formed to provide an elongated central" axial bearing with an annular flange on one end, 'i a drive spindle having a working fit in and extending through said bearing, a circularplate fixed on the projectin end of said spindle in coaxial relation to the spindle and head and having'an' an'nular flange on itsedge portion projectin toward the flange on saidhead and having slots provided therein in circumferentially spaced relation, elongated arms pivoted at their inner ends on the'flange portionof said head at circumferentially spaced points that are spaced radially outwardly from the longitudinal axis of the head, said arms'being slidable intermediate 1 their ends in and extending through said slots as guides, abrading devices of elongated form disposed substantially parallel to the longitudinal axis of the head and pivotally mounted intermediate their" ends on and Weighting the other ends of said arms as flyweights, and means fastening said plate to said head against turning'relative to it and so as "to clamp said arms frictionally on' the top and bottom? surfaces thereof between'said head and plate in adjusted posi tion, said means comprising'a nut threaded on said spindle and arranged to jamagainst'thef end of'siaidfhe'ad' remote frorn saiduplateand, v arms, wherebvto drawthe plate 'towardlsaid;

head by means of said spindle;

9."In a tool of the character described, a in;

tatable head, a plate in assembled coaxial rela- 'tion; to said head and-adapted to turn with respect thereto, a drive spindle for the tool extendin througha bearingain said head and secured to said plate, elongated arms pivoted at their inner ends on said. head for oscillation and projectable from thehead substantially radially, 1

guides on said plate slidably engaging'thearms intermediate their ends, elongated carrier bars kind described comprising a" head formed to provide an elongated central axial I bearing with an annular flange on one end, a drive spindle having a working fit in and 'extend- 9 of the associated cross-bar to clamp the abrasive unit so that the free end of the roll of abrasive sheet material is gripped firmly, the rubber material of the core being compressed to grip the roll of sheet material resiliently.

BERD L. JOHNSON.

REFERENCES CITED file of this patent;

Number t 10 UNITED STATES PATENTS Name Date Howard Oct. 23. 1888 Webster Feb. 5, 1901 Weber Jan. 9, 1912 Storm Nov. 20, 1923 Harter June 17, 1924 Heon Aug. 25, 1925 Blettner Mar. 23, 1926 Hamilton Sept. 7, 1948 

